/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns true if an element is parented to another element
True if the given parent and given child have a parent-child relationship
bool IsParentedTo ( int32 InChildIndex, int32 InParentIndex, const [TElementDependencyMap](API\Plugins\ControlRig\Rigs\URigHierarchy\TElementDependencyMap) & InDependencyMap ) const